Packing box



FIG. 1 is a front view of a packing box, showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front, left, and top perspective view thereof. 

CLAIM The ornamental design for a packing box, as shown and described. 